Gustav werner



(No Model.)

G. WERNER.

MANUFAGTURHOF WOOD PULP.

Patented J an. 31,

INVENTOR ATTORNEY N PETERS. mwwumq m lwr. WashinglomDQ ilwrren SharesPAT NT MANUFACTURE OF woo'o PULP.

SPECIFICATION forming part of Letters Patent No. 252,983, dated. January31, 1882.

Application filed September 19, 1881. (No model.)

is a specification.

In the manufacture of wood pulp for paper it has been always customaryto grind the wood by pressing it with the fibers in a position at rightangles to the grinding-surface at the outer circumference ofthevertically or horizontally revolving grindstones. Attempts have alsobeen made to grind the wood by feeding it to the surface of thegrindstone with the fibers parallel thereto, which method has beenmentioned in the original patent for woodgrinding, taken by H.Voelter;but this method did not give good results, and was consequentlyabandoned.

The object of this invention is to furnish an improved method ofgrinding wood, which stands midway between the two methods mentioned,and by which the wood is fed vertically downward on the top surface of ahorizontallyrevolving grindstone, but in such a position that the fibersform an acute angle of inclination toward the direction of motion ofthestone, it being based on the well-known fact that it is very diificultto rasp a piece of wood transversely or parallel to its fibers, whilethe rasping or grinding is accomplished with comparative ease with thetool at an angle of forty-five degrees to the direction of the fibers.Experience alsohas shown that by the first method the fibers are apt tobe torn and injured, while by the second method long fibers and by thethird method thin, long, and soft fibers are obtained.

The invention consists, therefore, first, of a method ofgrindingthe woodby feeding itin vertical direction toward the top surface of ahorizontally-revolving grindstoue with the fibers at a suitable acuteangle to the direction of motion oft-he same; and, secondly, ofanapparatus for grinding wood pulp, which is provided with a number ofvertically-supported and axiallyadjustable receiving-boxes, havingdisk-shaped flanges, which flanges are set into openings of thetop-plate of the apparatus. The grindstone is composed of a number ofpieces which are fitted together and rigidly supported on a i flangedring-frame. As the stone is worn out its relative position to thereceiving-boxes is made vertically adjustable by means of avertically-adjustable step-bearing, aswill appear more fullyhereinafter.

In the accompanying drawings, Figure 1 represents a vertical centralsection of my improved apparatus for making wood pulp, on line a 00,Fig. 2; and Fig. 2 is a plan view of the same.

Similar letters of reference indicate corre sponding parts.

Referring to the drawings. A repre ents a number of oblong receivingboxes,which are provided with disk -shaped flanges B, thesmoothly-ground circumferences of which are guided in siinilarly-grouinlseats ofthe top openings ofthe casingUof the apparatus, so thatt-heboxes A may be readily set at any desired angle toward the direction ofmotion of the stone. The lower edges of the receiving-boxes A areaccurately fitted to the upper surface of the horizontallyrevolvinggrindstone, so as to prevent the too coarse grinding of the wood. Thepieces of wood which are to be exposed to the grinding action of thestone are pressed down upon the surface of the same by means of verticalracks Gr Gr and pinions H, which racks are either weighted separatelyfor each box or for all the boxes jointly in the same manner ascustomary in apparatus of this class. The racks G G are not attacheddirectly to the followers J J, but are screwed to intermediate pieces KK, which are capable of following with the followers J J the axialmotion of the boxes A Awhenever the latter are set so as to assume adifferent angular position toward the direction of the motion of thestone.

The grindstone D is composed of a number and hardness, which aresupported on a ringshaped frame, D, having an exterior retaining-flange,D as shown clearly in Fig. 1. By this construction of the grindstone thecracking or other injuring of the stone, which happens frequently withstoues made of one piece, is entirely avoided. A compound grinds'tone ofthe construction described has, furthermore, the advantage that it hasafar better grindingsurface, without any soft portions. and that it ofcarefully-selected pieces, of uniform grain.

can be obtained more easily and at less expense than the 1arge-sizedgrindstones heretofore in use, the surface of which was never of uniformtexture and grain throughout. The consequence was that the surfaceshowed the wear at the softer parts and had to be frequently re-,dressed, so that the stone was in most cases injured more by thedressing made necessary by the unequal character of its surface than bythe actual work accomplished.

The wood to be ground is fed by the receiving-boxes to the top surfaceof the stone and ground by contact therewith. The ring-shaped frame D ofthe stone D is secured by a center hub to a vertical central shalt whichrevolves at the lower end in a step-bearing, E, at its middle part in abearing, E, of the casing 0, and at the upper part in a bearing, E asshown in Fig. 1.

The water required for grinding is thrown in a spray from the centertoward the wood to be ground, and carried by centrifugal power to thegrimling-surface between the wood and stone, by which the grindingprocess is accelerated in a higher degree than with the apparatusheretofore in use, in which the wood is pressed against thegrinding-surface of the stone at its outer periphery, and in which thepater is carried away, instead of toward the grinding surfaces, by thecentrifugal force.

To keep up the revolving grindstone at the proper relative position tothe receiving-boxes, even when the grinding surface gradually wearsdown, the step-bearing E is made vertically adjustable, in a similarmanner as the runner of a flour-grinding mill by means of a pinionmeshing with a gear-wheel of a screwnut that engages the threaded shankof the step hearing. The step bearing E itself is guided in a fixedupright cylindrical casing, as shown in Fig. 1.

For dressing the stone two openings, L and M, are provided in the casingG of the apparatus, which openings are nearly equal in size to theopenings for the receiving-boxes.

Having thus described myinvention, I claim as new and desire to securebyLetters Patent- The method herein described of grinding wood intopulp, which consists in feeding the pieces of wood vertically downwardupon the top surface of a horizontally-revolving grindstone and holdingthem in such a manner thereon that the fibers form an acute angle ofinclination to the direction of motion of the grindstone, substantiallyas set forth.

2. The combination, with a horizontally-revolving grindstone, ofaninclosiug casing havin g circular top openings, of vertical receivingboxes having disk-shaped flanges guided in seats of the openings, andof mechanism whereby the wood in the receiving-boxes is pressed downupon the stone, said boxes and the feed mechanism being adapted to beaxially set at any angle toward the direction of motion of thegrindstone, substantially as specified.

3. In an apparatus for grinding wood into pulp, a grindstone composed ofa number of jointed sections, in combination with a ringshapedsupporting-frame having an exterior retaining-flange, substantially asset forth.

4. In an apparatus for grinding wood into pulp, the combination of thefixed exterior casing having circular top openings, verticalreceiving-boxes having exterior disk-shaped flanges guided in seats ofthe top openings, a horizontally-revolving grindstone below the boxes,and means for adjusting the same vertically toward the lower end of thereceivingboxes, substantially as specified.

5. In an apparatus for making wood pulp, the combinationof the fixedreceiving-boxes with a revolving grindstone and with means for adjustingthe same vertically toward the lower end of therevolving boxes,substantially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

' GUSTAV WERNER.

\Vitnesses FRIEDRICH Vorrn, 0'r'ro GRIMBERGER.

